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From: russ lyttle <lyttlec@removegmail.com>
Newsgroups: comp.lang.ada
Subject: Re: Gnat Problem - Freezing too soon
Date: Thu, 28 Feb 2019 16:31:58 -0500
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Date: 2019-02-28T16:31:58-05:00
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On 2/28/19 4:19 PM, Anh Vo wrote:
> On Thursday, February 28, 2019 at 10:34:46 AM UTC-8, russ lyttle wrote:
>> Example from the bookAnalysable Real-Time Systems :
>>
>> 1  package Environment_Monitor.Ch4_Status is --Protected
>> 2    protected type Methane_Agent (Ceiling : Priority)
>> 3     with Priority => Ceiling
>> 4       is new CH4_Safety
>> 5    with
>> 6      overriding function Check_Safe return Methane_Status;
>> 7      overriding procedure Set_Safety (M : Methane_Status);
>> 8    private
>> 9       Current_Status : Methane_Status := Motor_Unsafe;
>> 10   end Methane_Agent;
>> 11 end Environment_Monitor.Ch4_Status;
>>
>> Gnat complains that Methane_Agent is frozen at line 2, and line 3 is
>> trying to change an attribute after being frozen.
>   
> I do not have this book. Could you post a minimally compile-able codes if not completed ones.
> 
> Anh Vo
> 
That is the entire environment_monitor-ch4_status.ads code. If line 2 is 
commented out, everything compiles and runs.